Alactasia

Lactose intolerance (or hypolactasia) is the term used to describe a decline in the level of lactase, an enzyme needed for proper metabolization of lactose (a sugar that is a constituent of milk and other dairy products), in human beings. Although an estimated 70% of adult humans are considered lactose intolerant, it is uncommon in healthy northern westerners and a few others groups.
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Alactasia /alac·ta·sia/ malabsorption of lactose due to deficiency of lactase; see lactase deficiency. [more]Alactasia - Community and Resources

noun
condition where there is a deficiency of lactase in the intestine, making the patient incapable of digesting milk sugar (lactose)

انعدام اللاكتاز